Topic: 112 MPH in 5th and still pulling (Read 9730 times)

cahdbiker · « **on:** February 01, 2016, 11:36:11 PM »

Hi Guys, I was on my favorite "getting it on road" called Las Posas Rd in Ventura County. I was wondering if anyone could tell me what my RPM was at 112MPH in 5th gear. I forgot to take a note of it since I was concentrating on the road in front of me. Las Posas Rd is great for a speed run because it is flat without any peripheral foliage. The only issue is the farm workers who park along the side of the road. Natually I was not going 112MPH where they were working. If you google Las Posas Rd. in Ventura County Ca. and scan towards the ocean you will see Pt. Mugu . The bolder there is in the picture of my bike below. The car companies love that stretch of highway for commercials so you have probably all seen it at one time or another. Anyways back to my question if someone knows what RPM I was doing when I hit 112MPH in 5th I would like to know. All the gearing on my 09 is stock. Thanks in advance. CAHDBIKER

JCZ · « **Reply #1 on:** February 02, 2016, 08:37:38 AM »

Not sure what the rpm is at that speed. Is this the first time you've gone that fast?

I know where Pt. Magoo is, been by it a number of times but have never saw it on car commercials. Down here all we see is the Coronado Bridge in the local car commercials. Car commercials are done locally.

Hope you two are able to make it up to the Redwoods Run......3 1/2 months!

Cat Eye · « **Reply #2 on:** February 02, 2016, 03:35:34 PM »

If I recall 5th gear is a 1 to 1 ratio....if so then just check to see what your rpm is at 56 mph then just double it.

Dan_Lockwood · « **Reply #3 on:** February 02, 2016, 04:23:27 PM »

Quote from: Cat Eye on February 02, 2016, 03:35:34 PM

If I recall 5th gear is a 1 to 1 ratio....if so then just check to see what your rpm is at 56 mph then just double it.

Cat Eye:

Cruise Drive 6-speeds have 6th gear as 1:1, not 5th.

cahdbiker:

The rpms at 112 mph:

24.5" rear tire= 5069 rpms
25" rear tire= 4967 rpms
25.5" rear tire=4870

I'm guessing our rear tires are around 24.5", but not sure.

Our final drive ratio in 5th gear is 3.279 and in 6th gear it's 2.79.

Hope this helps you out.

grc · « **Reply #4 on:** February 02, 2016, 05:44:33 PM »

How was the 112 mph determined? If from the Harley speedometer, and it hasn't been recalibrated, figure at least a 5% error so the 112 becomes approximately 106. If from a stand alone GPS (not the built in version on the Rushed More bikes), the speed reading from the GPS will be much more accurate than the speedometer.

While 5th isn't 1:1, Cat Eye was on the right track if you just want an approximation. Ride the bike at 56 mph in 5th gear, note the rpms, and then multiply by 2 for the rpms at 112 mph. The relationship between speed and rpm is linear.

Jerry

JCZ · « **Reply #5 on:** February 02, 2016, 05:49:25 PM »

That's a whole nother issue Jerry. And isn't it progressive error? I mean at 80 mph you might only be a couple miles an hour off but above a hundred miles an hour you're going to be further off?

There's a whole thread on this HD phenomenon a few years back. The HD speedometers are right in line with all the other HD gauges, etc. with the attitude of "close is good enough".

grc · « **Reply #6 on:** February 02, 2016, 07:08:40 PM »

Quote from: JCZ on February 02, 2016, 05:49:25 PM

That's a whole nother issue Jerry. And isn't it progressive error? I mean at 80 mph you might only be a couple miles an hour off but above a hundred miles an hour you're going to be further off?

There's a whole thread on this HD phenomenon a few years back. The HD speedometers are right in line with all the other HD gauges, etc. with the attitude of "close is good enough".

That's why I mentioned a percentage error, not a set number of mph. 5% at 70 mph is about 3.5 mph, but that same 5% at 120 mph would be about 6 mph. Many are worse than that, some better. Usually, but not always, speedometer error in actual mph increases as speeds increase. Thus you can't really just tell people your speedometer is about X mph fast without qualifying that by saying X mph fast at YY mph. It's better to express it as "approximately X% fast".

Yes, Harley's gauges all leave a lot to be desired. I still say most of them are useless and were just included to fill up the holes Harley had molded into the fairing. As cheap as the ones they use are, it would have cost more to retool the fairing to eliminate the holes than it cost to buy and install the gauges.

It actually made perfect sense a few years back when they eliminated two of them and filled the holes with tweeters.

Jerry

Rooster · « **Reply #7 on:** February 02, 2016, 07:38:56 PM »

I use the speed on my GPS at 60 and above seems about 3 mph faster reading on the HD Speedo or reads 3mph lower on the GPS versus the HD Speedo. That hurts my head thinking about it.

VANAMAL · « **Reply #8 on:** February 02, 2016, 07:58:30 PM »

Jc hits the rev limiter in 6 th gear

JCZ · « **Reply #9 on:** February 02, 2016, 09:37:28 PM »

Quote from: VANAMAL on February 02, 2016, 07:58:30 PM

Jc hits the rev limiter in 6 th gear

So what was the rpms when I did that?

VANAMAL · « **Reply #10 on:** February 03, 2016, 12:05:19 AM »

i got new tires I'll take mine out this weekend and find out

cahdbiker · « **Reply #11 on:** February 04, 2016, 12:23:31 AM »

Good to know ThanksCAHDBIKER

Quote from: Dan_Lockwood on February 02, 2016, 04:23:27 PM

Cat Eye:

Cruise Drive 6-speeds have 6th gear as 1:1, not 5th.

cahdbiker:

The rpms at 112 mph:

24.5" rear tire= 5069 rpms
25" rear tire= 4967 rpms
25.5" rear tire=4870

I'm guessing our rear tires are around 24.5", but not sure.

Our final drive ratio in 5th gear is 3.279 and in 6th gear it's 2.79.

Hope this helps you out.

cahdbiker · « **Reply #12 on:** February 04, 2016, 12:32:10 AM »

JCZ, regarding your post, on this bike it is the first time to hit approx. 112. When my bike was completely stock I hit 105 up hill passing a 30 ft. fifth wheel pulled by a Ford Triton Dually. I was coming out of Casper Wyoming heading west towards Riverton. Had my wife on the back and luggage. A lady in a Blazer was kind enough to pass over a double line and head straight at us. So I gave her the 180 degree finger while still in 5th going up hill at approx. 105MPH . Proceeded to shift into 6th and held it at 100 for at least 3 miles. The only time I have gone faster then that was in a few cars I have had. Feels great!!! If I can get some info on the REDWOOD RUN I will try and make it since my wife is from that area. What I like about this site is that you can pretty much get any info you need, and if you say something that is incorrect people will correct you in a diplomatic fashion. Thanks CAHDBIKER

Quote from: JCZ on February 02, 2016, 08:37:38 AM

Not sure what the rpm is at that speed. Is this the first time you've gone that fast?

I know where Pt. Magoo is, been by it a number of times but have never saw it on car commercials. Down here all we see is the Coronado Bridge in the local car commercials. Car commercials are done locally.

Hope you two are able to make it up to the Redwoods Run......3 1/2 months!

RonandJanet · « **Reply #13 on:** February 08, 2016, 12:38:45 PM »

I have not taken mine much past 100 MPH (just enough to know I did it). I do cruise at 75 and 80 all the time! The gauges may not be perfect but it is also hard to get an exact reading on it. I do like the GPS readings better. I know she read a little high before but when the dealer replaced the bad one (it would not go back to 0 stayed at something like 4 MPH) the new was much better. I used the GPS and my wife's car to compare I was rarely off 2 miles an hour (tried this at 50 and 70). I know this isn't exact either I was just making sure I was in the ball park. I would not be surprised if the gauges on all my vehicles are not perfect. Hell I am not perfect so my girl and I will just cruise at whatever speed we feel comfortable with!

VANAMAL · « **Reply #14 on:** February 12, 2016, 08:49:25 PM »

This was in a 55 mph zone. I told the cops my name was jc

JCZ · « **Reply #15 on:** February 12, 2016, 10:11:01 PM »

Quote from: VANAMAL on February 12, 2016, 08:49:25 PM

This was in a 55 mph zone. I told the cops my name was jc

JC would have posted that pic right side up.

SBB · « **Reply #16 on:** February 12, 2016, 10:48:11 PM »

Quote from: JCZ on February 12, 2016, 10:11:01 PM

JC would have posted that pic right side up.

I have a picture (right side up) of a ride we took with JC.
He said "we are going to pick up the pace a bit."

And he did, for the next 30 miles the GPS read 100.
When we started climbing the mountain he slowed down, , , , to 90.
What a ride.

SBB

JCZ · « **Reply #17 on:** February 12, 2016, 11:21:30 PM »

Yer honor that wasn't me.....I wasn't there....I would never ride like that...I don't even know this guy! I'm pleadin "Not Guilty"

ltank · « **Reply #18 on:** February 16, 2016, 08:33:12 PM »

Things happen quickly at Speed. I don't go past 110 very often. I have done 135 in 6th but couldn't tell you the RPM, I was too busy being scared. I had been cruising at 80 to 85 for miles on interstate.
There were several big trucks in front of me stirring up debris and I got tired of it so I passed them as fast as could. It was weird slowing down to 80 again it felt slow. Then about 40 miles later I got a ticket for 80 in a 70. Bright side is he didn't get me at almost full throttle in 6th.

ltank · « **Reply #19 on:** February 16, 2016, 08:38:57 PM »

I can do 110 to 115 in 5th at 5200 rpm then hit 6th. Got good gearing and a .86 O.D. gearset with 118 hp@ 5600 rpm and 125 TQ @ 3800 rpm and bike weight 575 lbs. I LIKE IT!

GMR-PERFORMANCE · « **Reply #20 on:** February 23, 2016, 02:16:09 PM »

6th in the cruise drive is 1:1 and tire growth is one item that effects speedo cal .. I run them on the dyno all the time and many times will re adjust for the customer if tuner in use allows that function.. I see well over 100 as we do run bikes in 6th gear as the dyno is calibrated to run them at that rate per DJ.. I see 140+ MPH and even then its not off by much 3-5 mph is an avg. ( at that speed there is some tire growth) I would look to see at 100 or so less than.. HD has been better with the speedo thing in the last few years.. No idea as to why as earlier bikes it was common to see GPS and dyno MPH numbers that where 5+ off vs what the speedo read Speedo read was for the most part faster than actual . Not so much any longer

T-Hawk · « **Reply #21 on:** March 01, 2016, 02:43:49 PM »

GPS said 126mph as my max speed obtained... still felt like there was more throttle and rpm remaining, but the aerodynamics (lack thereof) seemed like I had hit a wall. Even with a slight down hill grade, it didn't seem to want to go any faster. That, and I'd had enough of the adrenaline so I've not revisited the attempt.

GMR-PERFORMANCE · « **Reply #22 on:** March 01, 2016, 06:38:45 PM »

You need a shark extremely stable at high speeds

JCZ · « **Reply #23 on:** March 01, 2016, 06:41:33 PM »

Quote from: GMR-PERFORMANCE on March 01, 2016, 06:38:45 PM

You need a shark extremely stable at high speeds

Even at the North Pole, Alaska?

GMR-PERFORMANCE · « **Reply #24 on:** March 01, 2016, 06:46:55 PM »

YEP YEP just have to install the front ski and rear track kit

http://www.helmethairblog.com/switch-traxx-motorcycle-to-snowmobile-conversion-kit HA HA

HUBBARD · « **Reply #25 on:** May 21, 2016, 10:34:35 AM »

Maybelle at 120 MPH is turning 5000 RPM, in 6th. Later--HUBBARD

Rooster · « **Reply #26 on:** May 21, 2016, 02:06:05 PM »

Nice to hear

Unbalanced · « **Reply #27 on:** May 21, 2016, 11:10:28 PM »

Quote from: HUBBARD on May 21, 2016, 10:34:35 AM

Maybelle at 120 MPH is turning 5000 RPM, in 6th. Later--HUBBARD

Hub is that on the Speedo or on the GPS that you are getting that speed reading?

HUBBARD · « **Reply #28 on:** May 22, 2016, 12:14:31 AM »

Quote from: Unbalanced on May 21, 2016, 11:10:28 PM

Hub is that on the Speedo or on the GPS that you are getting that speed reading?

That's the speedo and the tach. I'll do it again with the GPS, or is it already recorded in the GPS? If it is, how do I pull it up? Later--HUBBARD

Unbalanced · « **Reply #29 on:** May 22, 2016, 01:08:23 AM »

Which GPS are you using? If its Garmin or RoadTech it should be able to do MaxSpeed in a window to tell you what the speed was.

HUBBARD · « **Reply #30 on:** May 22, 2016, 10:04:01 AM »

Quote from: Unbalanced on May 22, 2016, 01:08:23 AM

Which GPS are you using? If its Garmin or RoadTech it should be able to do MaxSpeed in a window to tell you what the speed was.

The Garmin that came with Maybelle. It says 117 MPH. So the speedo is 3 MPH fast. Thanks for educatiing me on that. If it warms up today, I'm gonna' stretch her legs out a little! Later--HUBBARD

Unbalanced · « **Reply #31 on:** May 22, 2016, 10:06:36 AM »

Happy to help, yours is off less than mine I am at about 5 mph. I hope the rain subsides so you get to ride. Its 85 and sunny here. We're having breakfast at Tim's over in Port Orange. Nice cool ride over this am but gonna be a hot one.

bigmegina · « **Reply #32 on:** June 05, 2016, 10:15:05 PM »

Quote from: cahdbiker on February 01, 2016, 11:36:11 PM

Hi Guys, I was on my favorite "getting it on road" called Las Posas Rd in Ventura County. I was wondering if anyone could tell me what my RPM was at 112MPH in 5th gear. I forgot to take a note of it since I was concentrating on the road in front of me. Las Posas Rd is great for a speed run because it is flat without any peripheral foliage. The only issue is the farm workers who park along the side of the road. Natually I was not going 112MPH where they were working. If you google Las Posas Rd. in Ventura County Ca. and scan towards the ocean you will see Pt. Mugu . The bolder there is in the picture of my bike below. The car companies love that stretch of highway for commercials so you have probably all seen it at one time or another. Anyways back to my question if someone knows what RPM I was doing when I hit 112MPH in 5th I would like to know. All the gearing on my 09 is stock. Thanks in advance. CAHDBIKER

you probally were not going that fast.motorcycle speedos can be off by 10%.still going pretty good for a dresser.

heath28 · « **Reply #33 on:** June 05, 2016, 10:24:34 PM »

Is there a good phone app that would do a max speed and average speed reading?

Sent from my SM-T800 using Tapatalk

Author Topic: 112 MPH in 5th and still pulling (Read 9730 times)